Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
anh tang » anh bang, anh dang, anh nang
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
than cau » toan cau, phan cau, than cap
toan tap » toan ban
tang va » trang va, tang van, thang va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sach - anh tang va nhung ((cong tan) or (cong tac)) ((than cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - anh tang va nhung ((cong tan) OR (cong tac)) ((than cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - anh tang va nhung ((cong tan) or (cong tac)) ((than cau) or (toan tap))*.